Web Reference: 217 I have a table and one of the columns is "Date" of type datetime. We decided to add a default constraint to that column May 25, 2018 · For the purposes of this article, say you want to add a DEFAULT constraint to an existing column. To add a DEFAULT constraint to an existing column, use the ALTER TABLE statement and specify the column and the specific constraint that you want to apply. The DEFAULT constraint is used to automatically insert a default value for a column, if no value is specified. The default value will be added to all new records (if no other value is specified).
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